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<title>Using about.html to debug infocenters</title>
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<h1>Using about.html to debug infocenters</h1>

<p>
When developing an infocenter sometimes not all of the books show as expected or 
customizations do not have the desired effect. The about.html page can be used to get information 
about installed plug-ins and help system preferences. If the home page of the help system is 
<pre>http://&lt;hostname&gt;:&lt;port&gt;/help/index.jsp</pre> the about page has a url of 
<pre>http://&lt;hostname&gt;:&lt;port&gt;/help/about.html</pre> 
Without any parameters the about page shows a list of all plug-ins installed on the system. 
Parameters can be added to show other kinds of information as follows:
<ul>
<li>
<code>about.html?show=preferences</code> shows the values of the help system preferences.
</li>
<li>
<code>about.html?show=agent</code> shows the user agent information from the Web Browser used to 
read the page.
</li>
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